Some conclusions about the student database

Startup.cs ConfigureServices
appsettings.json

problem

• Consider how good name

Troubleshooting

• And LocalContext table name in the same class name
• Add connectionstring in Startup.cs reference service.AddContext
  connectionstring in Chinese character data table
• A copy of the form of reference data to txt again
• Code First 的 增 改删
  Add-Migration Initial
  Add-Migration AddModelName
  Add-Migration ModifyModelName
  Update-Database
• Authentication is used
  to add authentication cookie information and app.useAuthentication in Startup.cs in ()
  to add years to perform at login
• Additions to the deletion plus entity
  using _context.Student_DB. Add and the Remove
  _context.SaveChanges ()

、

• 一些有用的命令
  public LocalContext(DbContextOptions<LocalContext> options) : base(options) { }
  public DbSet<Student> Students_DB { get; set; }
  public DbSet<Course> Courses_DB { get; set; }
  "ConnectionStrings": {
  "StudentsDb": "Data Source=DESKTOP-61L5TCQ\MSSQLSERVER2017;Initial Catalog=StudentsDb;User ID=sa;Password=123456;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False"
  }
  services.AddDbContext<LocalContext>(options =>
  options.UseSqlServer(Configuration.GetConnectionString("StudentsDb")));

services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
.AddCookie(options =>
{
options.LoginPath = new PathString("/login/");
options.AccessDeniedPath = new PathString("/login/denied");
});
app.UseAuthentication();

Add-Migration Initial
Add-Migration AddModelName
Add-Migration ModifyModelName

string username = Request.HttpContext.User.Claims.FirstOrDefault(s => s.Type == ClaimTypes.Sid).Value;
string role = Request.HttpContext.User.Claims.FirstOrDefault(s => s.Type == ClaimTypes.Role).Value;
ViewBag.Stu = _context.Students_DB.FirstOrDefault(x => x.Username == username);

_context.Students_DB.Add(stu);
_context.SaveChanges();
return RedirectToAction(nameof(MainController.Index),"Main");

Student stu = _context.Students_DB.Find(id);
_context.Students_DB.Remove(stu);
_context.SaveChanges();
return RedirectToAction(nameof(MainController.Index), "Main");

<a href="add"> add </a> and <a href="/add"> add </a> difference

<form action="filter">
<p>
学号: <input type="text" name="identify">
<input type="submit" value="filter" />
</p>
</form>
public IActionResult Filter(int identify)
{
//Student stu = _context.Students_DB.Find(identify);
var stu = _context.Students_DB.Where(x => x.SNumber == identify);
ViewBag.Stu = stu;
return View();
}